123919820 has 12 divisors (see below), whose sum is σ = 260231664. Its totient is φ = 49567920.

The previous prime is 123919793. The next prime is 123919847. The reversal of 123919820 is 28919321.

It is an interprime number because it is at equal distance from previous prime (123919793) and next prime (123919847).

It is a super-2 number, since 2×123919820² = 30712243577664800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3097976 + ... + 3098015.

It is an arithmetic number, because the mean of its divisors is an integer number (21685972).

Almost surely, 2^123919820 is an apocalyptic number.

123919820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123919820 is an abundant number, since it is smaller than the sum of its proper divisors (136311844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123919820 is a wasteful number, since it uses less digits than its factorization.

123919820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6196000 (or 6195998 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 123919820 is about 11131.9279552106. The cubic root of 123919820 is about 498.5555913855. Note that the first 4 decimals are identical.

The spelling of 123919820 in words is "one hundred twenty-three million, nine hundred nineteen thousand, eight hundred twenty".